Advanced treatment equipment for seafood catering oily wastewater

Abstract

The utility model discloses deep treatment equipment for oily wastewater of seafood catering, which belongs to the technical field of sewage treatment equipment and comprises an integrated closed box body, a first oil stain separation unit, a second oil stain separation unit, a first biochemical treatment unit, a second biochemical treatment unit, a precipitation unit, an oil sludge storage and discharge unit and an equipment room unit are sequentially arranged in the integrated closed box body along the wastewater treatment flow direction and are communicated with one another through internal flow guide channels; bipolar nano aeration equipment is arranged in each of the first oil stain separation unit and the second oil stain separation unit, each bipolar nano aeration equipment comprises a nano bubble generator and a bipolar aeration pipe which are connected with each other, and the bipolar aeration pipes are arranged along the bottom of the first oil stain separation unit / the second oil stain separation unit. Through the combined design of'bipolar nano aeration and salt-tolerant composite filler ', aiming at the characteristics of high salt and high oil contamination of the seafood wastewater, the oil contamination removal rate can reach 95% or above, the ammonia nitrogen removal rate is stabilized to be 90% or above, and the COD removal rate reaches 85% or above.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment equipment technology, and more specifically, to a deep treatment device for oily wastewater from seafood restaurants. Background Technology

[0002] Food wastewater, especially seafood food wastewater, is characterized by high salinity, high ammonia nitrogen, high COD, and high oil content. Traditional treatment equipment struggles to achieve efficient purification because the food cleaning and cooking processes generate a large amount of oil and suspended particulate matter, and are rich in organic pollutants such as proteins and amino acids.

[0003] Currently, existing catering wastewater treatment technologies have the following core problems:

[0004] Low treatment efficiency: Traditional oil separators can only remove floating oil and cannot simultaneously degrade ammonia nitrogen and COD; conventional biological treatment equipment is poorly adapted to the high-salt environment of seafood wastewater, microbial activity is inhibited, ammonia nitrogen removal rate is often less than 60%, and COD removal rate is less than 70%, making it difficult to meet emission standards.

[0005] The equipment is bulky: Traditional sewage treatment systems require multiple independent structures such as grease traps, biological treatment tanks, and sedimentation tanks, which occupy a large area and are especially unsuitable for scenarios where land is scarce around catering establishments.

[0006] Low level of automation: Most equipment requires manual adjustment of aeration intensity and cleaning of oil sludge, resulting in high operation and maintenance costs and fluctuations in treatment effect due to human error.

[0007] Insufficient targeting: Existing equipment is not optimized for the high salt and high protein characteristics of seafood wastewater. The "emulsified oil" caused by the mixture of oil and organic matter is difficult to demulsify, resulting in excessive load on subsequent biochemical treatment and easy sludge bulking problems.

[0008] In view of this, the present invention is proposed to solve the above-mentioned technical problems. Utility Model Content

[0009] The purpose of this utility model is to provide a deep treatment device for oily wastewater from seafood restaurants, so as to solve the technical problem that existing restaurant wastewater treatment devices are unable to remove ammonia nitrogen, chemical oxygen demand (COD) and oil from wastewater, and achieve wastewater discharge in compliance with standards.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] A deep treatment device for oily wastewater from seafood restaurants includes an integrated sealed box. The integrated sealed box is provided with a first oil separation unit, a second oil separation unit, a first biochemical treatment unit, a second biochemical treatment unit, a sedimentation unit, an oil sludge storage and discharge unit, and an equipment room unit arranged sequentially along the wastewater treatment flow direction. All units are connected to each other through internal guide channels.

[0012] Both the first and second oil-stain separation units are equipped with bipolar nano-aeration devices. The bipolar nano-aeration devices include a nano-bubble generator and a bipolar aeration pipe connected to each other. The bipolar aeration pipes are arranged along the bottom of the first / second oil-stain separation unit, and the aeration direction is towards the side wall and the liquid surface of the first / second oil-stain separation unit, respectively.

[0013] Both the first and second oil-water separation units are equipped with arc-shaped oil-water collection pipes at the top, and the arc-shaped oil-water collection pipes are connected to the sludge storage and discharge unit through guide pipes.

[0014] The bottom of both the first and second biochemical treatment units is equipped with microporous aerators, and the middle is filled with salt-resistant biological-porous ceramic composite packing.

[0015] Furthermore, the sedimentation unit is equipped with a conical sludge hopper, and a circulation pump is installed at the bottom of the conical sludge hopper. The outlet pipe of the circulation pump is connected to the first biological treatment unit and the second biological treatment unit respectively.

[0016] Furthermore, the sludge storage and discharge unit is equipped with a sludge lift pump, which is equipped with a timing control module and a liquid level sensor.

[0017] Furthermore, the equipment room unit integrates a vortex blower, a sump pump, a phosphorus removal dosing device, an electrical control box, and an exhaust fan. The electrical control box is electrically connected to the nano bubble generator, the microporous aerator, the circulating pump, the sludge lifting pump, the vortex blower, the sump pump, and the exhaust fan, respectively. The vortex blower and the microporous aerator are connected through air ducts.

[0018] Furthermore, the bipolar nano-aeration device generates bubbles with a diameter of 50-100nm, and the arc-shaped oil collection pipe has an inclined oil collection groove with a width of 5-8mm on its wall.

[0019] Furthermore, the aeration pore size of the microporous aerator is 1-3μm, and the stacking height of the salt-resistant biological-porous ceramic composite packing is 2 / 3 of the height of the biochemical treatment unit.

[0020] Furthermore, the phosphorus removal dosing device includes a reagent storage tank, a metering pump, and a static mixer, with the static mixer connected in series with the effluent pipe of the sedimentation unit.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] Through the combined design of "bipolar nano aeration + salt-resistant composite filler", the oil removal rate can reach more than 95%, the ammonia nitrogen removal rate is stable at more than 90%, and the COD removal rate reaches more than 85%, which are specifically designed for the high salt and high oil characteristics of seafood wastewater.

[0023] By integrating seven functional units into a single enclosure, it is much smaller than traditional decentralized sewage treatment systems (reducing the floor space by more than 60%), making it suitable for installation in small spaces in catering establishments.

[0024] The PLC control system enables fully automated management of equipment start-up and shutdown, parameter adjustment, and fault alarms, requiring only 1-2 manual inspections per week and regular cleaning of sludge, reducing labor costs by more than 70%.

[0025] The parallel biochemical unit design combined with microbial reflux technology enables the equipment to adapt to fluctuations in wastewater salinity (3%-5%) and COD (1000-3000mg / L), ensuring stable treatment results and avoiding a decrease in compliance rate due to water quality shocks.

[0026] The bipolar nano aeration equipment solves the problem of traditional oil separators being difficult to demulsify. The salt resistance of the composite packing breaks through the bottleneck of low biochemical efficiency in high-salt environments. Furthermore, the phosphorus removal device can be selected as needed to meet the emission requirements of different users. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0028] Figure 1 This is a top view of the deep treatment equipment for oily wastewater from seafood restaurants provided in this embodiment of the application;

[0029] Figure 2 This is a cross-sectional view of the deep treatment equipment for oily wastewater from seafood restaurants provided in this embodiment of the application.

[0030] Reference numerals in the attached drawings: 1. First oil-water separation unit; 2. Second oil-water separation unit; 3. First biochemical treatment unit; 4. Second biochemical treatment unit; 5. Sedimentation unit; 6. Oil sludge storage and discharge unit; 7. Equipment room unit; 8. Nanobubble generator; 9. Arc-shaped oil-water collection pipe; 10. Microporous aerator; 11. Conical sludge hopper; 12. Circulation pump; 13. Oil sludge lift pump; 14. Submersible sludge pump in the sump; 15. Vortex blower; 16. Oil separator. Detailed Implementation

[0031] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0032] See Figures 1 to 2 As shown, a deep treatment device for oily wastewater from seafood restaurants includes an integrated sealed box. Within the integrated sealed box, along the wastewater treatment flow direction, are sequentially arranged a first oil separation unit 1, a second oil separation unit 2, a first biochemical treatment unit 3, a second biochemical treatment unit 4, a sedimentation unit 5, an oil sludge storage and discharge unit 6, and an equipment room unit 7. All units are connected via internal flow channels. Both the first oil separation unit 1 and the second oil separation unit 2 are equipped with bipolar nano-aeration devices. The bipolar nano-aeration devices include connected nano-bubble generators 8 and bipolar aeration pipes. The bipolar aeration pipes flow along the first oil separation unit... The first oil-sludge separation unit 1 and the second oil-sludge separation unit 2 are arranged at the bottom, and the aeration direction is respectively towards the side wall and the liquid surface of the first oil-sludge separation unit 1 and the second oil-sludge separation unit 2. The top of the first oil-sludge separation unit 1 and the second oil-sludge separation unit 2 are provided with arc-shaped oil-sludge collection pipes 9. The arc-shaped oil-sludge collection pipes 9 are connected to the oil sludge storage and discharge unit 6 through the guide pipe. The bottom of the first biochemical treatment unit 3 and the second biochemical treatment unit 4 are evenly arranged with microporous aerators 10, and the middle is filled with salt-resistant biological-porous ceramic composite filler. The salt-resistant biological-porous ceramic composite filler has salt resistance and high biochemical treatment / degradation efficiency in high salt environment.

[0033] It should be noted that the first oil separation unit 1 and the second oil separation unit 2 are connected in series; the first biochemical treatment unit 3 and the second biochemical treatment unit 4 are connected in parallel; a support plate is installed below the salt-tolerant biological-porous ceramic composite packing to prevent the salt-tolerant biological-porous ceramic composite packing from clogging the microporous aerator 10; the first biochemical treatment unit 3 and the second biochemical treatment unit 4 are connected in parallel, and the inlet of the first biochemical treatment unit 3 is connected to the outlet of the second oil separation unit 2 through a diversion valve to achieve uniform wastewater distribution and enhance the stability of the biochemical reaction; the outlet of the sedimentation unit 5 is equipped with an inclined tube sedimentation tank to further remove residual fine flocs in the water and ensure the clarity of the effluent; the first oil separation unit 1 and the second oil separation unit 2 are connected to the oil sludge storage and discharge unit 6 through an arc-shaped oil collection pipe 9 to receive the gravity-flowing oil and scum.

[0034] In the above scheme, the nanobubble generator 8 and bipolar aeration pipe can generate micro-nano bubbles with a diameter of 50-100nm. On the one hand, the buoyancy of the bubbles carries suspended particles and emulsified oil to the surface. On the other hand, the water flow disturbance generated by bipolar aeration breaks the emulsification balance between oil and water. The collected oil is transported to the sludge storage and discharge unit 6 through the arc-shaped oil collection pipe 9 and the guide pipe to realize the recovery of oil. Then the wastewater enters the first biological treatment unit 3 and the second biological treatment unit 4. The microporous aerator 10 provides continuous and uniform oxygen to the first biological treatment unit 3 and the second biological treatment unit 4. Through the nitrification-denitrification of the salt-tolerant biological-porous ceramic composite packing, heterotrophic degrading bacteria decompose COD to achieve the simultaneous removal of ammonia nitrogen and COD.

[0035] See some possible implementations. Figure 1 and Figure 2 As shown, the sedimentation unit 5 is equipped with a conical sludge hopper 11, and a circulation pump 12 is installed at the bottom of the conical sludge hopper 11. The outlet pipe of the circulation pump 12 is connected to the first biochemical treatment unit 3 and the second biochemical treatment unit 4 respectively. Through the circulation pump 12, the microbial flocs settled in the conical sludge hopper 11 are returned to the first biochemical treatment unit 3 and the second biochemical treatment unit 4, so that the microbial concentration in the first biochemical treatment unit 3 and the second biochemical treatment unit 4 is maintained at 3000-5000 mg / L, ensuring degradation efficiency.

[0036] See some possible implementations. Figure 1 and Figure 2 As shown, the sludge storage and discharge unit 6 (which directly adopts existing technology, and this application will not describe the specific structure of the sludge storage and discharge unit 6 in detail) is equipped with an sludge lifting pump 13. The sludge lifting pump 13 is equipped with a timer control module and a liquid level sensor. The discharge port of the sludge lifting pump 13 extends to the outside of the equipment and is equipped with a timer control module. It can be started periodically according to the amount of sludge accumulation (monitored by the liquid level sensor in the pool) to discharge and clean the sludge. The inner wall of the sludge storage and discharge unit 6 is equipped with an anti-corrosion coating to prevent the high-salt wastewater from corroding the pool.

[0037] See some possible implementations. Figure 1 and Figure 2 As shown, the equipment room unit 7 integrates a vortex blower 15, a sump pump 14, a phosphorus removal dosing device, an electrical control box, and an exhaust fan. The electrical control box is electrically connected to the nano bubble generator 8, the microporous aerator 10, the circulating pump 12, the sludge lifting pump 13, the vortex blower 15, the sump pump 14, and the exhaust fan. The vortex blower 15 is connected to the microporous aerator 10 through a duct.

[0038] In the above scheme, the vortex blower 15 has a wind pressure adjustment range of 0.3-0.5MPa, providing a stable air source for the first biochemical treatment unit 3 and the second biochemical treatment unit 4. The sump pump 14 is installed in the sump at the bottom of the equipment room unit 7 and is equipped with a water level float switch. When the water level in the equipment room exceeds the warning value due to rainy season water accumulation or pipe leakage, it will automatically start drainage to prevent the equipment from being damaged by moisture. The electrical control box has a built-in PLC control system, which is electrically connected to the bipolar nano aeration equipment, circulation pump 12, sludge lifting pump 13, vortex blower 15, sump pump 14 and other components. It can monitor the pH value, dissolved oxygen (DO), liquid level and other parameters of each unit in real time, and automatically adjust the equipment operation according to the preset program. The exhaust fan is installed on the inner wall of the equipment room unit 7 and starts at regular intervals to discharge the heat and moisture generated by the operation of the equipment, maintaining a dry environment in the equipment room.

[0039] See some possible implementations. Figure 1 and Figure 2 As shown, the bipolar nano-aeration device produces bubbles with a diameter of 50-100nm, and the arc-shaped oil collection pipe has an inclined oil collection groove with a width of 5-8mm on its wall.

[0040] See some possible implementations. Figure 1 and Figure 2 As shown, the aeration pore diameter of the microporous aerator 10 is 1-3 μm, and the stacking height of the salt-resistant biological-porous ceramic composite packing is 2 / 3 of the height of the biochemical treatment unit.

[0041] See some possible implementations. Figure 1 and Figure 2 As shown, the phosphorus removal dosing device includes a reagent storage tank, a metering pump, and a static mixer. The static mixer is connected in series with the effluent pipe of the sedimentation unit 5. The phosphorus removal dosing device (directly adopting existing technology) includes a reagent storage tank, a metering pump, and a static mixer. The static mixer is connected in series with the effluent pipe of the sedimentation unit. When the user has phosphorus removal requirements for the effluent, the phosphorus removal agent (such as polyaluminum chloride) is added in proportion through the metering pump to achieve total phosphorus removal.

[0042] Workflow

[0043] Influent and oil separation: Seafood restaurant wastewater is first pretreated by an oil separator and then enters the first oil separation unit. The bipolar nano-aeration equipment is activated, generating micro-nano bubbles that carry suspended particles, floating oil and emulsified oil to the surface. These are collected by the top arc-shaped oil collection pipe 9 and introduced into the oil sludge storage and discharge unit 6. After the wastewater undergoes preliminary oil removal in the first oil separation unit 1, it flows into the second oil separation unit 2 for secondary enhanced oil removal, further reducing the oil concentration to below 10 mg / L.

[0044] Biochemical degradation: After oil removal, the wastewater is evenly introduced into the first biochemical treatment unit 3 and the second biochemical treatment unit 4 through the diversion valve. The vortex blower 15 drives the microporous aerator 10 to aerate, so that the DO in the first biochemical treatment unit 3 and the second biochemical treatment unit 4 is maintained at 2-4 mg / L. When the wastewater flows through the salt-tolerant biological-porous ceramic composite packing, the salt-tolerant biological-porous ceramic composite packing decomposes COD through nitrification-denitrification and heterotrophic degrading bacteria, so as to achieve the simultaneous removal of ammonia nitrogen and COD.

[0045] Sedimentation and sludge return: After biological treatment, the wastewater enters the sedimentation unit 5, where microbial flocs settle in the conical sludge hopper 11. The circulating pump 12 returns part of the sludge to the first biological treatment unit 3 and the second biological treatment unit 4 to replenish the amount of microorganisms. After the supernatant is settled in the inclined tube sedimentation tank, if the user has phosphorus removal requirements, the phosphorus removal dosing device is started. The static mixer is used to fully mix the reagent with the wastewater, and finally the wastewater is discharged in compliance with the standards.

[0046] Oil sludge discharge and equipment maintenance: The oil sludge in the oil sludge storage and discharge unit 6 is monitored by a liquid level sensor. When it accumulates to a preset height, the electrical control box controls the oil sludge lifting pump 13 to start and discharge the oil sludge. The exhaust fan in the equipment room runs on a timer, and the sump pump 14 automatically starts and stops according to the water level, realizing unattended operation and maintenance. Example

[0047] A seafood restaurant generates an average of 15 m³ of wastewater daily. The wastewater quality is as follows: oil concentration 80-120 mg / L, ammonia nitrogen concentration 60-80 mg / L, COD concentration 1500-2000 mg / L, and salinity 3.5%-4%. The deep treatment equipment for oily seafood restaurant wastewater provided in this application is used for treatment, with the specific parameters set as follows:

[0048] Bipolar nano-aeration equipment: power 1.5kW, aeration frequency 50Hz, producing bubble diameter 80nm;

[0049] Salt-resistant bio-porous ceramic composite filler is a composite filler with salt resistance and high biochemical treatment / degradation efficiency in high-salt environments, with a filling amount of 0.8 m³.

[0050] Vortex blower 15: air pressure 0.4MPa, air volume 2m³ / min;

[0051] Circulating pump 12: Flow rate 10 m³ / h, reflux ratio 50%;

[0052] Phosphorus removal dosing device: Add polyaluminum chloride (concentration 10%) at a dosage of 50 mg / L (user requirement: total phosphorus ≤ 0.5 mg / L).

[0053] Treatment results: After 30 days of continuous operation, the effluent quality remained stable as follows: oil concentration ≤5mg / L (removal rate 95.8%), ammonia nitrogen concentration ≤5mg / L (removal rate 92.3%), COD concentration ≤100mg / L (removal rate 93.5%), and total phosphorus concentration ≤0.4mg / L, all meeting the Class A discharge standard. No sludge bulking occurred during equipment operation, and oil sludge only needed to be cleaned once a week (approximately 0.2m³ each time). No dedicated personnel were assigned to monitor the equipment; parameters were only monitored remotely through the electrical control box.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A deep treatment device for oily wastewater from seafood restaurants, characterized in that, The integrated sealed box includes a first oil separation unit (1), a second oil separation unit (2), a first biochemical treatment unit (3), a second biochemical treatment unit (4), a sedimentation unit (5), an oil sludge storage and discharge unit (6), and an equipment room unit (7) arranged sequentially along the wastewater treatment flow direction. Each unit is connected to the other through an internal guide channel. Both the first oil separation unit (1) and the second oil separation unit (2) are equipped with bipolar nano aeration devices. The bipolar nano aeration devices include a nano bubble generator (8) and a bipolar aeration pipe connected to each other. The bipolar aeration pipe is arranged along the bottom of the first oil separation unit (1) / second oil separation unit (2), and the aeration direction is respectively towards the side wall of the first oil separation unit (1) / second oil separation unit (2) and the liquid surface. Both the first oil separation unit (1) and the second oil separation unit (2) are equipped with arc-shaped oil collection pipes (9) at the top, and the arc-shaped oil collection pipes (9) are connected to the sludge storage and discharge unit (6) through a guide pipe; The bottom of the first biochemical treatment unit (3) and the second biochemical treatment unit (4) are evenly provided with microporous aerators (10), and the middle is filled with salt-resistant biological-porous ceramic composite packing.

2. The deep treatment equipment for oily wastewater from seafood restaurants according to claim 1, characterized in that, The sedimentation unit (5) is equipped with a conical sludge hopper (11), and a circulation pump (12) is installed at the bottom of the conical sludge hopper (11). The outlet pipe of the circulation pump (12) is connected to the first biochemical treatment unit (3) and the second biochemical treatment unit (4) respectively.

3. The deep treatment equipment for oily wastewater from seafood restaurants according to claim 2, characterized in that, The sludge storage and discharge unit (6) is equipped with a sludge lifting pump (13), and the sludge lifting pump (13) is equipped with a timing control module and a liquid level sensor.

4. The deep treatment equipment for oily wastewater from seafood restaurants according to claim 3, characterized in that, The equipment room unit (7) integrates a vortex blower (15), a sump pump (14), a phosphorus removal dosing device, an electrical control box, and an exhaust fan. The electrical control box is electrically connected to the nano bubble generator (8), the microporous aerator (10), the circulating pump (12), the sludge lifting pump (13), the vortex blower (15), the sump pump (14), and the exhaust fan. The vortex blower (15) is connected to the microporous aerator (10) through a duct.

5. The deep treatment equipment for oily wastewater from seafood restaurants according to claim 1, characterized in that, The bipolar nano-aeration device generates bubbles with a diameter of 50-100nm, and the arc-shaped oil collection pipe has an inclined oil collection groove with a width of 5-8mm on its pipe wall.

6. The deep treatment equipment for oily wastewater from seafood restaurants according to claim 4, characterized in that, The aeration pore diameter of the microporous aerator (10) is 1-3 μm, and the stacking height of the salt-resistant biological-porous ceramic composite packing is 2 / 3 of the height of the biochemical treatment unit.

7. The deep treatment equipment for oily wastewater from seafood restaurants according to claim 4, characterized in that, The phosphorus removal dosing device includes a reagent storage tank, a metering pump and a static mixer, with the static mixer connected in series with the outlet pipe of the sedimentation unit (5).

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